Get smart curated videos delivered to your inbox.   SUBSCRIBE
The Kid Should See This

Rock Swing Cup & more DIY playground physics

Next time you’re on the swings, think about what it might be like if you were swinging on the moon, free from air resistance. AP Physics teacher Jared Keester had that in mind during this experiment: Swing jumping with a rock and a plastic cup to see how each encounters that air resistance here on Earth.

Related videos: The Apollo 15 Hammer and Feather Drop on the moon (1971) — the video Keester references — and this beautiful BBC recreation: The Hammer-Feather Drop in the world’s biggest vacuum chamber.

Plus, watch two more DIY Professor Keester demos that are easy for kids to try at home on their own – A water tornado and a slinky wave:

Check out more videos with vortices, slinkys, and falling stuff.

via @ThePhysicsGirl.

This Webby award-winning video collection exists to help teachers, librarians, and families spark kid wonder and curiosity. TKSST features smarter, more meaningful content than what's usually served up by YouTube's algorithms, and amplifies the creators who make that content.

Curated, kid-friendly, independently-published. Support this mission by becoming a sustaining member today.

🌈 Watch these videos next...

How to make smoke rings with a simple DIY vortex cannon

Rion Nakaya

Building a waterfall swing from scratch

Rion Nakaya

A diver makes underwater vortex rings that can knock over rocks

Rion Nakaya

How to make a Crazy Pool Vortex – Physics Girl

Rion Nakaya

Build your own space-time warping demo for the classroom

Rion Nakaya

How a Slinky falls in slow motion

Rion Nakaya

What happens when you put marshmallows in a vacuum?

Rion Nakaya

2,000 ping pong balls and 30 middle-school teachers in Zero G

Rion Nakaya

How to make Leonardo da Vinci’s self-supporting bridge

Rion Nakaya